Unbalance correction mechansm in a lock-up damper

Details Unbalance correction mechansm in a lock-up damper Unbalance correction mechansm in a lock-up damper

1988-06-02

1990-01-02

Braun, Leslie A.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 329, 192 33, F16D 3900, F16D 350

Patent

active

048907065

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. TECHNICAL FIELD
The present invention relates to an unbalance correction mechanism in a lock-up clutch of a torque converter which selectively put the torque converter in an inactive (lock-up) condition and an active condition.
BACKGROUND ART
FIGS. 14 and 15 illustrate principal parts of the U.S. Pat. No. 4,240,532. In FIG. 14, a lock-up damper of 100 is disposed between a front cover 102 and turbine 107 of a torque converter. Front cover 102 is welded at a portion 104 to a pump 103 and is connected at an outer peripheral coupling 106 to an input shaft 114. Turbine 107 is connected by rivets 110 to a hub 109 splined onto an output shaft 115. Stator 108 has an one-way clutch 111, of which inner race 112 is splined to a stationary cylindrical shaft 116. The lock-up damper 100 comprises a piston, or clutch plate, axially slidably supported on the hub 109, a drive ring 118 welded to a rear surface (right side surface) of the outer peripheral portion of the clutch plate 117, circumferentially extending damper springs 120 disposed in pockets 119 in the drive ring 118, and a driven ring 122 which have claws 121 engaging with the damper springs 120 and is fixed to the turbine 107. A friction facing 123 is fixed to a front surface of the outer peripheral portion of the clutch plate 117. When the facing 123 on the clutch plate 117 is pressed onto the front cover 102 by a difference between pressures at the opposite sides of the clutch plate 117, the front cover 102 is directly connected or locked up to the turbine 107 through the damper springs 120 in the lock-up damper 100.
The drive ring 118 in FIG. 15 has outer rims 125 and support walls 126 for forming the spring pockets 119, as shown in FIG. 15, as well as projections 127 and 128 which form spring receivers at opposite sides of the spring pockets 119, respectively. Each spring pocket 119 accommodates a set of one long damper spring 120 and one short damper spring 120a. The claws 121 are disposed between springs 120 and 120a.
In the lock-up damper including the piston assembly (clutch plate 117, drive ring 118, lock-up damper 100 and others) and the driven ring 112 which are formed as independent parts from each other as shown in FIGS. 14 and 15, unbalance is corrected by welding a balance piece to a radially middle portion of the piston 117, e.g., by spot welding or projection welding, or by punching out by a press machine a region, e.g., of a half-circular shape, which corresponds to an unbalance amount, at a cylindrical extention formed at the outer peripheral portion of the piston 117.
However, in the welding, (1) the balance piece may drop and close a hydraulic circuit during the driving. (2) It is laborious to remove spatters or the like produced by the welding. (3) The piston (clutch plate 117) may be deformed by the welding, which may cause nonuniform contact of the lock-up facing 123, resulting in disadvantages such as wear and heat damage.
In the press punching at the outer peripheral portion of the piston, it is necessary to provide at the radially outer portion of the piston with an extension (extra flange) which axially projects beyond the portion necessary for supporting the damper springs 120, resulting in remarkable increase of the weight.
The object of the invention is to prevent the disadvantages such as dropping of the balance piece, entry of the spatters and deformation of the piston, as compared with the conventional balance piece welding method, and to reduce the weight, as compared with the conventional press punching at the radially outer portion of the piston.


DISCLOSURE OF THE INVENTION

The present invention provides an unbalance correction mechanism in a lock-up damper, wherein a turbine in a main part of a torque converter is disposed between a pump, which is faced to the turbine and located at one side thereof, and a front cover which is located at the other side of the turbine and connects the pump to an input shaft, and is connected to an output shaft, a clutch plate frictionally engageable with the front cover i

REFERENCES:
patent: 4512449 (1985-04-01), Motomura et al.
patent: 4570764 (1986-02-01), Nishimura
patent: 4646886 (1987-03-01), Nishimura

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